CERN Accelerating science

Article
Report number arXiv:2405.14305
Title High-Precision Spectroscopy of O20 Benchmarking Ab Initio Calculations in Light Nuclei
Author(s) Zanon, I. (INFN, Legnaro ; Ferrara U.) ; Clément, E. (GANIL) ; Goasduff, A. (INFN, Legnaro) ; Menéndez, J. (ICC, Barcelona U.) ; Miyagi, T. (Darmstadt, Tech. U. ; Heidelberg, Max Planck Inst. ; Darmstadt, GSI) ; Assié, M. (IJCLab, Orsay) ; Ciemała, M. (Cracow, INP) ; Flavigny, F. (LPC, Caen) ; Lemasson, A. (GANIL) ; Matta, A. (LPC, Caen) Mostra tots els 81 autors
Publication 2023-12-28
Imprint 2024-05-23
Number of pages 7
Note Supplemental Material available
In: Phys. Rev. Lett. 131 (2023) 262501
DOI 10.1103/PhysRevLett.131.262501 (publication)
Subject category Nuclear Physics - Experiment
Abstract The excited states of unstable 20O were investigated via γ-ray spectroscopy following the 19O(d,p)20O reaction at 8 AMeV. By exploiting the Doppler Shift Attenuation Method, the lifetime of the 22+ and 31+ states were firmly established. From the γ-ray branching and E2/M1 mixing ratios for transitions deexciting the 22+ and 31+ states, the B(E2) and B(M1) were determined. Various chiral effective field theory Hamiltonians, describing the nuclear properties beyond ground states, along with a standard USDB interaction, were compared with the experimentally obtained data. Such a comparison for a large set of γ-ray transition probabilities with the valence space in medium similarity renormalization group ab-initio calculations was performed for the first time in a nucleus far from stability. It was shown that the ab-initio approaches using chiral EFT forces are challenged by detailed high-precision spectroscopic properties of nuclei. The reduced transition probabilities were found to be a very constraining test of the performance of the ab-initio models.
Copyright/License preprint: (License: arXiv nonexclusive-distrib 1.0)
publication: © 2023-2024 American Physical Society



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